Complete 'Friends and Followers resources' section, add _getUsingCurs…

…or() utility function

lib/twitter.js

@@ -415,9 +415,15 @@ Twitter.prototype.getWeeklyTrends = function(params, callback) {
 // List resources
 
 Twitter.prototype.getLists = function(screen_name, params, callback) {
-	// FIXME: handle cursor stuff
+	if (typeof params === 'function') {
+		callback = params;
+		params = null;
+	}
+
+	params = merge(params, {key:'lists'});
+
 	var url = '/' + screen_name + '/lists.json';
-	this.get(url, params, callback);
+	this._getUsingCursor(url, params, callback);
 	return this;
 }
 
@@ -531,6 +537,40 @@ Twitter.prototype.deleteDirectMessage
 
 // Friends and Followers resources
 
+Twitter.prototype.getFriendsIds = function(id, callback) {
+	if (typeof id === 'function') {
+		callback = id;
+		id = null;
+	}
+
+	var params = { key: 'ids' };
+	if (typeof id === 'string')
+		params.screen_name = id;
+	else if (typeof id === 'number')
+		params.user_id = id;
+
+	var url = '/friends/ids.json';
+	this._getUsingCursor(url, params, callback);
+	return this;
+}
+
+Twitter.prototype.getFollowersIds = function(id, callback) {
+	if (typeof id === 'function') {
+		callback = id;
+		id = null;
+	}
+
+	var params = { key: 'ids' };
+	if (typeof id === 'string')
+		params.screen_name = id;
+	else if (typeof id === 'number')
+		params.user_id = id;
+
+	var url = '/followers/ids.json';
+	this._getUsingCursor(url, params, callback);
+	return this;
+}
+
 // Account resources
 
 Twitter.prototype.verifyCredentials = function(callback) {
@@ -584,3 +624,37 @@ Twitter.prototype.deleteFavorite
 // Streamed Tweets resources
 
 // Search resources
+
+
+/*
+ * INTERNAL UTILITY FUNCTIONS
+ */
+
+Twitter.prototype._getUsingCursor = function(url, params, callback) {
+	var self = this,
+		key = params.key || null,
+		result = [];
+
+	// if we don't have a key to fetch, we're screwed
+	if (!key)
+		callback(new Error('FAIL: Results key must be provided to _getUsingCursor().'));
+	delete params.key;
+
+	// kick off the first request, using cursor -1
+	params = merge(params, {cursor:-1});
+	this.get(url, params, fetch);
+
+	function fetch(data) {
+		// FIXME: what if data[key] is not a list?
+		if (data[key]) result = result.concat(data[key]);
+
+		if (data.next_cursor_str === '0') {
+			callback(result);
+		} else {
+			params.cursor = data.next_cursor_str;
+			self.get(url, params, fetch);
+		}
+	}
+
+	return this;
+}